New ODiate^® Raman Longpass Edge Filters

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Overview

ODiate^® Raman Edge Filters deliver critical performance benefits for researchers and instrument developers by improving signal clarity and streamlining optical system design. With ultra-high optical density (OD) blocking of Rayleigh scatter and high transmission of Raman-shifted light, these filters enable precise detection of low-wavenumber Raman signals with exceptional sensitivity and enhanced signal-to-noise ratio.

ODabs > 6 at laser line
Tabs ≥ 90% and Tavg ≥ 93% over transmission range
ODavg ≥ 6 over the blocking range

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Products

Compare	Model	Compatibility	rankScore	Material	Availability	Featured Item
New OD8-RLP488-B Raman Longpass Edge Filter, ODiate®, 25.0 mm, 488 nm Laser Line Contact Us	New OD8-RLP488-B Raman Longpass Edge Filter, ODiate®, 25.0 mm, 488 nm Laser Line	UNIVERSAL	1.0	Fused Silica	Contact Us	New
New OD8-RLP532-B Raman Longpass Edge Filter, ODiate®, 25.0 mm, 532 nm Laser Line Contact Us	New OD8-RLP532-B Raman Longpass Edge Filter, ODiate®, 25.0 mm, 532 nm Laser Line	UNIVERSAL	1.0	Fused Silica	Contact Us	New
New OD8-RLP633-B Raman Longpass Edge Filter, ODiate®, 25.0 mm, 633 nm Laser Line Contact Us	New OD8-RLP633-B Raman Longpass Edge Filter, ODiate®, 25.0 mm, 633 nm Laser Line	UNIVERSAL	1.0	Fused Silica	Contact Us	New
New OD8-RLP785-B Raman Longpass Edge Filter, ODiate®, 25.0 mm, 785 nm Laser Line Contact Us	New OD8-RLP785-B Raman Longpass Edge Filter, ODiate®, 25.0 mm, 785 nm Laser Line	UNIVERSAL	1.0	Fused Silica	Contact Us	New

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Specifications

Type

Raman Longpass Filter
Size

Ø25.0 mm
Material

Fused Silica

Thickness

2.0 mm (substrate)
3.5 mm (housing)
Angle of Incidence

0° ± 2°, random polarization

Features

Raman Scattering

Raman scattering is a light-matter interaction in which photons are inelastically scattered by molecules, meaning the scattered light has a different energy (and wavelength) than the incident light. This energy difference corresponds to the molecules' vibrational or rotational energy levels, providing a unique spectral fingerprint that can be used to identify and analyze molecular structures. It's the fundamental principle behind Raman spectroscopy, a powerful, non-destructive chemical and material analysis technique.

ODiate Filter Manufacturing & Metrology

ODiate Raman Edge fFlters are manufactured using advanced thin-film deposition systems, ensuring optical filters achieve excellent transmission and reflection accuracy. ODiate filter specifications are verified utilizing commercial spectrophotometric tools in addition to Newport’s proprietary custom in-house tools to measure edge steepness resolution and deep blocking to optical density 8 [-log10(T)].

Environmental Stability and Physical Durability

The coating systems used to produce ODiate filters use a dense sputtering process to provide robust environmental reliability to meet the highest demands for thin-film coatings. The resulting highly durable coatings meet or exceed testing procedures including humidity, thermal shock, adhesion, chemical resistance, and moderate abrasion per U.S. Military and international standards.